Hamsters belong to the rodent group of mammals. Like all mammals, they are warm-blooded and have a hairy
skin. Females give birth to live young and feed them on their own milk. Rodents make up more than 50 percent of all the species
of mammal. They are named after the Lain word rodere, meaning "to gnaw." This is because all rodents have one pair of upper
incisor teeth and one pair of lower incisor teeth at the front of their mouth. These grow continually and wear against each
other as they gnaw at their food. Rodents range in size from the tiny Old World harvest mouse at around four grams to the
South American capybara at a massive 88 lbs. about ten thousand times heavier!